.ban_pic {
    position: relative;
    height: 380px;
    background-position: top center;
    background-repeat: no-repeat;
    background-size: cover;
    color: #fff;
}
.ban_nr {
    position: absolute;
    width: 1000px;
    top: 80px;
    left: 50%;
    margin-left: -500px;
    text-align: center;
    font-size: 16px;
    line-height: 30px;
}